Complex fault diagnosis identification method for vertical takeoff and landing aircraft based on composite observer

Abstract

The present invention discloses a complex fault diagnosis identification method for a vertical takeoff and landing aircraft based on composite observer. The method comprises following steps: Step 1: Establishing a system fault state equation; Step 2: Establishing a detection observer to quickly realize fault determination, namely, determining whether a system is faulty; Step 3. Establishing a set of single-channel diagnostic observer and multi-channel coupling separate observer, and using the single-channel diagnostic observer to preliminarily extract fault information and using the multi-channel coupling separation observer to realize fault location and accurate diagnosis; Step 4: Based on observation results from the step 2 and the step 3, quickly diagnosing a fault mode and fault information. The method can quickly and accurately realize fault identification by using attitude angle velocity information of the vertical take-off and landing aircraft, and lays foundation for control reconstruction and task reconstruction design.

Description

technical field [0001] The invention belongs to the technical field of aircraft control, and relates to a method for diagnosing and identifying composite faults of a power system and a servo system of a vertical take-off and landing aircraft. Background technique [0002] Vertical take-off and landing aircraft is a kind of high-precision and complex aircraft with fast ballistic changes, which requires high precision and high stability for the power system and servo system. However, the flight environment of vertical take-off and landing aircraft is complex, and the probability of failure in the power system and servo system is relatively high, which seriously affects the control performance, flight stability and flight capability of vertical take-off and landing aircraft. The power of the servo mechanism of the vertical take-off and landing aircraft is often provided by the power system, so the failure of the servo mechanism often occurs synchronously with the failure of the...

AI Technical Summary

Problems solved by technology

According to the control mechanism, there is serious coupling between the fault modes of the power system and the servo system, and it is difficult to realize the accurate fault diagnosis and identification under the above complex fault modes synchronously. The flight reliability of vertical take-off and landing aircraft has greatly affected the development of vertical take-off and landing aircraft in China

Images